Fix bugs where event handlers did not properly unregister themselves...

Assets/Scripts/UI/Game/HealthBarHUD.cs

@@ -19,6 +19,10 @@ public class HealthBarHUD : MonoBehaviour {
 		PlayerHealthUpdateEvent.handler += OnPlayerHealthUpdate;
 	}
 
+	void OnDestroy () {
+		PlayerHealthUpdateEvent.handler -= OnPlayerHealthUpdate;
+	}
+
 	private void OnPlayerHealthUpdate (PlayerHealthUpdateEvent e) {
 		if (!e.Victim.Identity.hasAuthority)
 			return;

Assets/Scripts/UI/Lobby/LobbyUIManager.cs

@@ -66,6 +66,8 @@ public class LobbyUIManager : MonoBehaviour {
 	}
 
 	void OnDestroy () {
+		LobbyMngr.onConnected -= OnConnected;
+		LobbyMngr.onDisconnected -= OnDisconnected;
 		PlayerConnectedEvent.handler -= OnPlayerConnectedEvent;
 	}